A new poll from Quinnipiac University shows a sharp slide in President Barack Obama’s standing among voters, with his approval rating plunging and a majority of voters saying he is not honest and trustworthy.

The Quinnipiac poll, released Tuesday, found that 54% of voters disapproved of the job he is doing as president, vs. 39% who approve. That compares with a 49% disapproval -45% approval margin in Quinnipiac’s Oct. 1 poll, and the previous low of 55-41 in October 2011.

In the new poll, more voters in every age and income group disapproved than approved, as did voters in two core Democratic blocs: women and Hispanics. Mr. Obama held onto strong approval numbers among African American voters.

Moreover, voters, by a margin of 52% to 44%, said that Mr. Obama is not honest and trustworthy. His previous worst showing by this measure was in a May 30 Quinnipiac poll, when voters narrowly said he was more trustworthy than not, by 49% to 47%.

“Any elected official with an 8-point trust deficit is in serious trouble,” said Tim Malloy, assistant director of the Quinnipiac University Polling Institute, in a statement.

In the past, as the Journal noted Monday, Mr. Obama has been buoyed through rough patches by voters’ general admiration for him as a person and by their trust in his credibility. But that has changed amid a harsh voter reaction to insurance cancellation letters now being mailed out as a result of the health-care law. These cancellations came after the president repeatedly pledged that anyone who liked their current plan could keep it, forcing the president the issue an apology.

On the Affordable Care Act, the Quinnipiac poll found a solid majority opposed to the new health law, 55%-39%. When asked specifically if voters believed that Mr. Obama “knowingly deceived” the public on the issue of keeping health insurance they liked, 47% said “no,” while 46% said “yes.”

The poll was conducted Nov. 6 – 11 and surveyed 2,545 registered voters. It has a margin of error of plus or minus 1.9 percentage points.

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